name_a="yu zhengjia love PYTHON"
'''.title()将每个单词首字母大小'''
print(name_a.title())   #输出   Yu Zhengjia Love Python

name_b="yu zhengjia love PYTHON"
'''.upper()将每个单词全改为大写'''
print(name_b.upper())   #输出   YU ZHENGJIA LOVE PYTHON

name_c="yu zhengjia love PYTHON"
'''.lower()将每个单词全改为小写'''
print(name_c.lower())   #输出   yu zhengjia love python